My [29F] daughter [8F] keeps biting and it’s making me frustrated.

So my daughter still bites. She’ll get mad or upset if I joke or play around with her and she bites. Just me. For example: We just went out for Trick or Treating since my town canceled it on Halloween. I had my step brother with me [age 11] and we were joking, that instead of saying “Happy Halloween” to say “Happy November 4th”. I said it to them, joking, a couple of times. The last time I said it, my daughter must have said it to the house we went to because she came down and goes “thanks for telling me to say that!!” And bent down and bit, wicked hard, my right arm. First time she ever drew blood and now I have a huge bruise. I don’t understand what’s possessed her to do that! Or why she still thinks it’s okay to bite when she gets mad. Any advice would be great because it’s incredibly frustrating.TL;DR: daughter keeps biting when she’s mad and it’s making me lose my mind on why at her age she keeps doing it. via /r/Parenting http://ift.tt/2zdDgUz